sql产生随机时间

--建立过程
CREATE PROCEDURE GetTime
    @BeginTime VARCHAR(5),
    @EndTime VARCHAR(5),
    @RandTime VARCHAR(5) OUTPUT
AS
    SET @RandTime=(SELECT SUBSTRING(CONVERT(VARCHAR,CONVERT(DATETIME,100/RAND(),120),120),12,5)) 
    WHILE @RandTime<=@BeginTime or @RandTime>=@EndTime 
        SET @RandTime=(SELECT SUBSTRING(CONVERT(VARCHAR,CONVERT(DATETIME,100/RAND(),120),120),12,5)) 
GO

--执行示例 
DECLARE @OutTime VARCHAR(5) 
EXEC GetTime '05:00','20:00',@Outtime OUTPUT
SELECT @outtime